package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

@Slf4j
@Aspect
@Component
public class AutoFillAspect {

	@Pointcut("execution(* com.sky.mapper.*.*(..)) && " +
			"@annotation(com.sky.annotation.AutoFill)")
	public void autoFillPointCut() {
	}

	@Before("autoFillPointCut()")
	public void autoFill(JoinPoint joinPoint) {
		//方法签名对象
		MethodSignature ms = (MethodSignature) joinPoint.getSignature();
		//获得方法上的注解对象
		AutoFill af = ms.getMethod().getAnnotation(AutoFill.class);
		//获得数据库操作类型
		OperationType operationType = af.value();

		//获取到当前被拦截的方法的参数--实体对象
		Object[] args = joinPoint.getArgs();
		if (args == null || args.length == 0) return;

		Object entity = args[0];

		LocalDateTime now = LocalDateTime.now();
		Long userId = BaseContext.getCurrentId();

		if (operationType == OperationType.INSERT) {
			//为插入操作设置创建时间、更新时间和创建人、修改人
			try {
				Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
				Method setCreateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
				Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
				Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
				//通过反射为对象属性赋值
				setCreateTime.invoke(entity, now);
				setCreateUser.invoke(entity, userId);
				setUpdateTime.invoke(entity, now);
				setUpdateUser.invoke(entity, userId);

			} catch (Exception e) {
				throw new RuntimeException(e);
			}
		} else if (operationType == OperationType.UPDATE) {
			try {
				Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
				Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
				setUpdateTime.invoke(entity, now);
				setUpdateUser.invoke(entity, userId);
			} catch (Exception e) {
				throw new RuntimeException(e);
			}
		}

	}
}
